#include <exam.h>
#include <stdio.h>

int Exam_add(int a, int b) { return a + b; }

int Exam_div(int a, int b)
{
    if (b == 0) {
        return 0;
    }
    return a / b;
}

typedef enum {
    E_Idle,
    E_GoingUp,
    E_GoingDown,
    E_AtTop,
    E_AtDown,
} ElevatorStatusType;